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Date: Wed, 23 May 2012 23:01:41 +0000 (UTC)
From: "John Jenkins (JIRA)" <jira@apache.org>
To: dev@avro.apache.org
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Subject: [jira] [Commented] (AVRO-1099) Int / Float cannot be decoded
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    [ https://issues.apache.org/jira/browse/AVRO-1099?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13282019#comment-13282019 ] 

John Jenkins commented on AVRO-1099:
------------------------------------

Sorry for the comment spam. I wish I could have just edited my original. If you change the "type" of "DoubleValue" from "double" to ["double", "int"] like this:

{code}

/**
 * This is a sample Avro schema for an entry with multiple possible types,
 * "double" or "int".
 */
private static final String DEFINITION = 
	"{" +
		"\"namespace\":\"test\"," +
		"\"type\":\"record\"," +
		"\"name\":\"DoubleTest\"," +
		"\"fields\":[" +
			"{" +
				"\"type\":[\"double\", \"int\"]," +
				"\"name\":\"DoubleValue\"" +
			"}" +
		"]" +
	"}";

{code}

Then, it will always throw an exception now matter which example you use:

{code}

Exception in thread "main" org.apache.avro.AvroTypeException: Expected start-union. Got VALUE_NUMBER_FLOAT
	at org.apache.avro.io.JsonDecoder.error(JsonDecoder.java:697)
	at org.apache.avro.io.JsonDecoder.readIndex(JsonDecoder.java:441)
	at org.apache.avro.io.ResolvingDecoder.doAction(ResolvingDecoder.java:229)
	at org.apache.avro.io.parsing.Parser.advance(Parser.java:88)
	at org.apache.avro.io.ResolvingDecoder.readIndex(ResolvingDecoder.java:206)
	at org.apache.avro.generic.GenericDatumReader.read(GenericDatumReader.java:148)
	at org.apache.avro.generic.GenericDatumReader.readRecord(GenericDatumReader.java:173)
	at org.apache.avro.generic.GenericDatumReader.read(GenericDatumReader.java:144)
	at org.apache.avro.generic.GenericDatumReader.read(GenericDatumReader.java:135)
	at test.AvroIntTest.main(AvroIntTest.java:62)

{code}
                
> Int / Float cannot be decoded
> -----------------------------
>
>                 Key: AVRO-1099
>                 URL: https://issues.apache.org/jira/browse/AVRO-1099
>             Project: Avro
>          Issue Type: Bug
>          Components: java
>    Affects Versions: 1.6.3
>         Environment: Mac OS X 10.7.3. Eclipse IDE for Java EE Developers 1.4.2.20120213
>            Reporter: John Jenkins
>              Labels: patch
>
> I am currently using a JSON library that is encoding 0 for a double to "0" instead of "0.0", without the quotes. First, I feel that "0" is a perfectly valid value for 0 as a double. But, I tried to code around it by changing the "type" of the field to "["double", "int"]", without the quotes and it is giving me this error:
> Exception in thread "main" org.apache.avro.AvroTypeException: Expected start-union. Got VALUE_NUMBER_INT
> 	at org.apache.avro.io.JsonDecoder.error(JsonDecoder.java:697)
> 	at org.apache.avro.io.JsonDecoder.readIndex(JsonDecoder.java:441)
> 	at org.apache.avro.io.ResolvingDecoder.doAction(ResolvingDecoder.java:229)
> 	at org.apache.avro.io.parsing.Parser.advance(Parser.java:88)
> 	at org.apache.avro.io.ResolvingDecoder.readIndex(ResolvingDecoder.java:206)
> 	at org.apache.avro.generic.GenericDatumReader.read(GenericDatumReader.java:148)
> 	at org.apache.avro.generic.GenericDatumReader.readRecord(GenericDatumReader.java:173)
> 	at org.apache.avro.generic.GenericDatumReader.read(GenericDatumReader.java:144)
> 	at org.apache.avro.generic.GenericDatumReader.read(GenericDatumReader.java:135)
> If I change it to just "int", then it works for a few records until it reaches a double.
> Thank you,
> John

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